1
Laboratory of Polymer Chemistry, Oran1 University Ahmed Benbella, BP 1524, El’Menouer, 31000 Oran, Algeria
2
Centre de Recherche Scientifique et Technique en Analyses Physico-chimiques (CRAPC), BP
38Bou-Ismail-RP 42004, Tipaza, Algeria
Corresponding author details:
Abdelkader Rahmouni
31000 Oran,Algeria
Copyright:
© 2020 Rahmouni A, et al.
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There is no doubt that the year 2020 remains an unforgettable era for all inhabitants
of the earth due to the terrible Covid-19 outbreak and its consequences; this epidemic has
confused scientists as they could not confront the challenge of its intelligence and decipher
its code, especially within the cell which makes it a favorite space for its reproduction. In this
paper, a design of drugs has been proposed to improve the therapeutic effects of antiviral
drugs, such as reducing drug resistance and drug toxicity as well assolubility at room
temperature. On the other hand,we have evaluated the therapeutic efficacy in the virology
of the synthesized molecules, called Bat molecules, and compared it to that of chloroquine.
Covid-19; Nanomaterials; Drug delivery; Chloroquine;Virology; Bat molecules
Chloroquine and its derivatives were approved in the late 1940s to treat malaria. Hydroxychloroquine, a derivative of chloroquine, is often used to treat rheumatoid arthritis and lupus [1]. Some doctors recommend the use of these drugs in a hope to reduce the duration of Covid-19 in their patients [2]. New results may create the hope that the antimalarial drug can be used in the fight against coronavirus [3]. The undesirable effects of chloroquine are, however, numerous. Hence, some distrust among certain doctors and scientists is created regarding its massive delivery to the patients suffering from Covid-19 before the end of the discovery test. The main side effects include [4]:
The data described in this paper is intended to provide a new method for the synthesis
of new antiviral molecules, called Bat molecules, especially for coronavirus (COVID-19), and
to compare its features to the chemical, physical and biological properties of chloroquine
molecule [10]. The bat molecules could overcome drug resistance, thereby suggesting
that the mechanism or phenomenon responsible for resistance is highly selective and
structurally specific. The anti-coronavirus activity of the Bat molecule-resistant viral strains
could only be due to a specific difference in the interaction with the resistance mechanisms
of the virus as shown in (scheme 4 and 5).
Materials and methods
Potassium hydroxide (KOH), sodium hydroxide (NaOH), sodium carbonate (Na2 CO3 ), potassium bicarbonate (KHCO3 ), nitric acid (HNO3 ), urea, orcinol, ethylene glycol, ethanol, hydrochloric acid (HCl) and potassium carbonate (K2 CO3 ) wereall purchased from Sigma Aldrich. Prior to use, the materials were dried under vacuum at 100°C for 2 minutes toremove residual water in the crystals [11]. The morphology and molecular structure of the samples were analyzed by using an X-ray fluorescence (XRF, Philips 1404 wavelength dispersive spectrometer) as well as a proton nuclear magnetic resonance )1 HNMR). 1 HNMR spectra were obtained by applying a 300 MHz Advance Bruker spectrometerat room temperature using tetramethylsilane (TMS) and deuterated chloroform (CDCl3 ) as an internal standard and the deuterated solvent, respectively. In addition, a scanning electron microscope (LEO SEM 1450) was utilized to obtain SEM images. Infrared spectra (ATR absorption) were recorded on an Alpha Brucker spectrometer in the wavelength range of 4000 to 400 cm−1 [12].
Synthesis of molecule 1
Molecule1 was formed throughthe condensation reaction between orcinol (2 g) and urea (2 g) in ionized water (20 mL). In this reaction, a nucleophilic substitution could take place by the corresponding amine [13]. This was carried out in the presence of a molar ratio of diamine and orcine reagents, helping to avoid the formation of the terminally disubstituted diamine. After heating the mixture with the conventional method for 10 minutes, the process was continued by dilution of carbonate potassium (1 M K2 CO3 ) as the catalyst. Even though the reaction completion was estimated, the yield was dependent on the solubility of the products in water during the reaction process. After the solution reduction to a small volume, the products were precipitated by the addition of cold ethanol. The pure compound was characterized by 1 H NMR as shown in Scheme 1 and Figures 1 and 2 [14].
Synthesis of molecule 2
The molecule called “Bat A”was prepared with slight modifications. Molecule 1 (0.05 g in 15 mL of ionized water) was added in a dropwise manner to a stirred solution of freshly distilled ethylene glycol (2 mL) in ionized water (5mL). NaOH (0.5g) as the catalyst was added to the mixture. The reaction mixture was stirred under inert atmosphere at 90°C for1 hour. The organic layer was separated and the aqueous layer was extracted with portions of cold ethanol (2 x 10 mL). The combined organic fractions were dried over anhydrous MgSO4 . Then,the impurities were removed under the reduced pressure to afford a brown solid. The Bat A molecule was a brown solid (1.78 g, yield 95.29%)with the chemical structure displayed in Scheme 2 and Figures 3 and 4.
Synthesis of molecule 3
The molecule called “Bat B”was prepared through a similar
process to the molecule Bat A preparation. First, molecule Bat A(1.2 g
in 15 mL of ionized water) was added dropwise into a stirred solution
of freshly distilled carbamates (2g) in ionized water (5mL). Then,
NaOH (0.75g) was introduced into the mixtureas the catalyst. The
reaction mixture was stirred under inert atmosphere at 95°C for 1
hour. Portions of the cold ethanol (2 x 10 mL)were used to separate
the organic layer and extract the aqueous layer. The combined organic fractions were dried over anhydrous MgSO4 and the impurities were
removed under the reduced pressure to reveal a brown solid which
wasthe molecule Bat B. Scheme 3 and Figures 5 and 6 present the
molecular features of the synthesized molecule Bat B (1.88 g, yield
96.02%).
Scheme 1: Chemical structure of the novel antigen molecule (1)
based on anti-covid-19 drugs
Figure 1: 1
H NMR (CDCl3
, 300 MHz) spectrum of the synthesized
antigen molecule (1)
Figure 2: FTIR spectrum of the synthesized antigen molecule (1)
Scheme 2: Chemical structure of the synthesized molecule “Bat
A” based on anti-covid-19 drugs
Figure 3: 1
H NMR spectrum of the Bat A molecule.
Figure 4: FTIR spectrum of the obtained Bat A molecule (2)
Scheme 3: Chemical structure of the Bat B molecule based on
anti-covid-19 drugs
Figure 5: 1
H NMR (CDCl3
, 300 MHz) spectrum of the Bat B
molecule
Figure 6: FTIR spectrum of the Bat B molecule
Scheme 4: Proposed mechanism of corona virus ( COVID-19)
under effect of bat molecules
Scheme 5: Presentation and explanation of the effect of chloroquine
and the bat molecule in the cell
There are many drug interactions with chloroquine-based
drugs such as Nivaquine® which must be taken into account before
prescription. There is also a need for close eye monitoring in the
long-term patients. Regular monitoring of liver and kidney functions
is, therefore, recommended. In addition, cardiac monitoring
is necessary, regarding the co-prescription of chloroquine or
hydroxychloroquine with Azithromycin to the patients with Sarscovid-2 (virus responsible for covid-19). Finally, chloroquine and its
derivatives are so-called «narrow therapeutic margin» drugs, which
means that the effective dose and the toxic dose are relatively close.
In the case of overdose or improper use, they can behighly toxic.
Bat molecule drugs interact with the virus in a way different from
that of chloroquine. These new molecules present some advantages
over the traditional chloroquine in anti-virology studies; it is safer to
handle as it is non-toxic, it is soluble in water at room temperature,
and its biological properties allow it to be monitored by the common
equipment. Using microscopy platform, we showed that the Bat
molecules could interact with virus in a manner different from that
of chloroquine, which is localized in the digestive vacuole of the
virus. Furthermore, the inhibited growth of chloroquine-sensitive
strains is more extensively in comparison to the resistant strains
against the bat molecules directly targeting the nucleus. We believe
that the synthesized molecules could be valuable tools in the future
drug discovery projects and so, they could be used in the treatment of
virus, especially covid-19.
This work, which was supported by the DGRSDT of Algeria, was
carried out within the State Program of the second national forum.
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